Electric-lamp socket.



F. A. LAVERCOMBE. ELECTRIC LAMP SOCKET. APPLICATION FILED JULY 23,1909.

Patented Aug. 1,1911.

Suvemtoz 1 11 111 11 0 11 /U 1 11/ 1 11 /l H 1, 11 v 1 fi 1 l1 Q" ,1 KM 1 5 Z N I 01 .111 Z Wituuaao FFIO.

nLnoTnIc-Lmr socxnr.

- Specification of Letters Patent. PatentedAug'. 1, 1911.

Appfication med July 23, 1909. Serial No. 509,246.

To all whom it may concern:

Be it knowr, that I, FREDERICK A. LilWnR- COMBE, a citizen of the United States, residing'at Newport, in the county of Campbell and State of Kentucky, have invented cer tain new .and useful Improvements in Electric-Lamp Sockets, of whichthe following is a specification.

My invention relates to in an electric light socket.

One of the objects of the invention is to produce an anti-vibration'support adapted to prevent'the breaking of the filaments, especially in tantulum or tungsten lamps.

Another object of the invention is to produce a socket core so formed as to permit of the socket binding posts being secured upon the outside of the core, thus preventing the necessity of forming wire passages through the body of the core.

Another object of the invention is to produce a core'to which the lamp socketcan be directly connected without the employment of screws or the like.

Another object of the invention is to produce a core with exteriorly supported binding posts permitting of the use of an exteriorly supported switchvof an improved construction. 7

Other features of the invention relate to means for conveniently and securely attaching and supporting the several parts relative to one another.

Other features and details of the invention will be more fully disclosed in the description of the accompanying drawings, forming a part of this specification, in which Figure l is a, central vertical section through my improved device the insulated an improyement lining being for convenience shown in full line. Fig. 2 is a side elevation showing the porcelain core, switch and lamp socket proper. Fig. 3 is a top plan view partly in section showing the switch. Fig. 4; is a plan view partly in section-of the spring support. Figs. 5 and 6 are views showing the means for connecting the cap to the other socket cover or shell. p

1 represents the plug or nozzle ordinarily screwed onto the end of the fixture and formed with a central orifice for the lamp wire.

2 represents an annular flange on the plug, the lower end of the plug being screw threaded.

- lower peripheral edge 6 of t "61' other non-conductive material. preferred teem, it has the upward annular 3 represents a supporting sleeve screwthreaded on.the lower end of the plug, its.

collar 4. ,The sleeve 3 is secured against rotation on the'plug by'means of the screw 5 engaging upwardly through the lower end of the sleeve 3 and impin ing against the he plug 1.

7 represents a spring support for the socket. Specifically it is shown in the form of a tripod, Fig. 4, having a central orifice engaging over the sleeve 3, the hub'lO seat ing on the collar 41 and having the spring blade members radially extending to form a means for suspending the socket.

12 represents a shell or cap formed with a central orifice 13, through which the sleeve 3 passes and formed with a downwardly extended annular flange 14. This construction of the shell forms a shoulder 15, which seats upon the extremities of the blades of spring 7,'so as to make an elastic extension support for the lamp and socket members relative to the fixed plug 1. I preferably employ a coiled spring 16, around the sleeve 3, seating upon the hub 10, of the spring 7, the upper extremity of this spring portion supporting the upper peripheral edge of the shell 12.

By means of these two spring members the suspended lamp parts have an elastic connection with the plug in both vertical and horizontal planes, so that no vibrations imparted to the plug or the fixture are transmitted to the lamp. The lower extremity of the shell 12 is provided with an inturned edge 17, formed with a series of vertical passages 18, and upwardly extended notches l9.

20 represents the outer socket shell formed with depending lugs 21, on its exterior. peripheral surface at the upper end providing the means by which the outer socket shell may be detachably secured to the. supporting cap 12, that is, by passing the lugs 21, upwardly through the passages 18, and turning the outer socket slightly so that these lugs are hooked into the notches 19. 7

22 represents an insulation lining for the outer socket20, held in position by inturned flange 23, of the socket 20.

24' represents the core formed of porcel? in In the flange 25, and the lower annular flange 26, forming a spool-like structure.

.28 represents the inner or loose socket having the ordinary bulb threads, this socket being metallic to form the electric connection with the filament. This socket is formed with the upper inturned flange 30, bent or spun over the upper face of the flange 26. This flange serves to suspend a lamp socket directly from the core without the use of any screws tapping into the core, and it also prov des an electric contact surface for the exteriorly supported switch member, to be later described. If desirable, the socket may also be provided with an inturned flange 31, bindingagains't the under surface of the lower annular flange 26, of the core. The outer peripheral edge of the upper flange 25, rests upon the edge of the" insulation lining 22, so that the porcelain core with its attached'lamp socket are supported by and suspended within the outer socket. Within the bore of the porcelain core is a metallic central contact piece 32 which forms one of the connections to the filament.

33 represents a binding screw, through the hub of the core 24, engaging into the contactpiece 32, thus providing the binding post on the outside of the core.

34 represents a collar on the hub of the core provided with a binding screw 35. One of the wires from the plug is connected to the binding screw 33, and the other wires to the binding screw 35.

36 represents a resilient switch-blade depending from the metallic collar 34, its intermediate portion being formed with a" cam or anabrupt shoulder 37, its lower ex treinity being formed with a cont-act foot 38, adapted to engage with the raised shoulder 39, formed on the flange 30.-

any other convenient way, and especially useful in its association with the switch located external of the core.

The circuit is established through the binding screw 35, collar 3%, switch 36, and shoulder 39 of the lamp socket, to one extremity of the filament, and through 0011- tact piece 32, and binding screw 33, to the otherextremity of the filament.

' By this construction, all of the lamp parts are bodily suspended from the cap 3, and the latter member is loosely and elastically supported relative to the fixedplug 1. This forms a very superior anti-friction socket support for tungsten lamps.

Bythe herein shown construction of porcelain core, I am enabled to attach the binding posts or screws exteriorly to the core, and also to make and break the circuit by a more durable and efiicient switch than is possible withthe familiar snap form of switch commonly used.

The parts may be easily separated and reassembled by non-skilled workmen and the relative attachments are very convenient and effective.

Having described my invention, I claim 1. An electric lamp fixture comprising, a plug, radially extended springs supported on the plug, a cap supportedupon said springs and movable relative to the plug, and lamp socket members suspended from said cap. 7

2. An electric lamp fixture comprising, a plug, radially extended springs supported on the plug, a cap supported upon said.

springs and movable relative to the plug,

lamp socket members detachably secured to and suspended from said cap.

3. An electric lamp fixture comprising, a plug, radially extending springs on the plug, a cap resting upon the springs and movably supported relative to the plug, an outer socket detachably suspended from said cap, a porcelain core, and-a lamp socket sup-' ported within said outer socket.

1. In an electric lamp fixture, a plug, a sleeve screw threaded thereon, a screw passing upwardly through the lower end of the sleeve and impinging against the plug to prevent the rotation of the sleeve, a collar on the sleeve, radially extended springs seated on the collar, and cap seated on the extremities of said springs, and a lamp socket detachably secured to and suspended from said cap.

5, In combination with a metallic lamp socket, a porcelain core supporting said socket, a central metallic piece within the core, said socket and said central piece being adapted to contact the terminals of the lamp, a binding post exteriorly supported on the periphery of the core and engaging into said central piece, a second binding post exteriorly supported on the core, and a switch exteriorly supported on the core and serving to connect the last-named binding post with the metallic lamp socket.

6. In an electric lamp fixture, an exterior socket, a spool-shaped porcelain core held within sa'd socket, a metallic lamp socket supported on the lower flange of the spool, a metallic piece through the bore of the spool, an exteriorly disposed binding post engaging through the hub of the spool int said centr'al piece, a secondbinding post 'exteriorly supported on. the hub pi the 'spool',-;and aswitch adapted to make and break connection between said last-named binding post and the lamp socket.

7. .In adevioe of the class described, a porcelain core havin a lower flange, \a

metallic lamp socket ormed onv said flange,

a binding post exteriorly supported on the core, a resilient switch blade having connection at one end with the binding post, the

free end extending adjacent to the lamp socket, and a lever for operating said resilient switch blade.

8. In a" device of the class described, a

core formed from a non-conductive mateof'the core, and a switch for making and breaking circuit connection supported on the outside of-said core.

9. In a device of the class described, a hollow core formed from a non-conductive material and provided with a flange at its lower end, a central contact piece in said core, a lampsmetallic socket suspended on said flange, exterior binding posts on the core, and a switch on the outside of the core.

10. In a device of the class described, a hollow core formed from a non-conductive material provided with a flange at its lower end, a lamp metallic socket bent over the periphery of said flange, a center contact piece in the core, a binding post extending through said core to the center contact, a second binding post held on the outside of the core, a resilient switch blade on the outside of the core, adapted to connect the second binding post with the metallic socket, and a lever for actuating said switch blade.

11. In a device of the class described, a hollow, core formed from a non-conductive material, and provided with a lower flange, alamp metallic socket bent over said flange and formed connections with said filament, a center metallic piece in the bore of the core also connected 'with the filament, a binding post engaging through the body of break contact with the'lamp socket. '5

' the coreaznd connected with the'center piece,

a metallic collar around said core, a binding 0st thereon, a resilient switch blade pro- 1ect1ngxfrom said collar into juxtapositlon be 'with the metallic socket,1'and a lever for I actuating said switch blade to make an 12. In an electric lamp fixture, a pin ,a, shell supported thereon and formed 'wi downwardly depending wall, the lowerl edge i of which is notched, and inwardly and upwardl turned to form anfinternal flange,

tlhere eing avertical passage through said ange lug, adapted to beinserted through said passage and to interlock with said notches when the socket is turned, whereby it is suspended from and locked to the Shell.

13. In an electric lamp fixture, a plug, a

shell supported thereon and having a downwardly depending wall formed with an inturned lower ed e constituting a supporting flange, there ing 'a vertical passage through said flange, said shell and having an external lug, adapted to be inserted through said passage and rest upon the flange when turned.

14. In an electric lamp fixture, a plug, a

sleeve nut externally screw threaded thereon, said -sleeve being formed with an inwardly extended annular flange occupying the position of vertical alinement with the" wall of the plug, and a set screw passing upwardly through said flange and impinging against the lower end of the plug.

15. In a device of the class described, a P g: supported within the outer socket, a lamp socket attached to the core, switch supported on the core, a vertic'al1y rocking lever for operating said switch, said outer socket being formed with a vertical slot, and said lever being formed with a lateral extensionpassing outwardly through 95 said vertical slot.

In testimony whereof, I have hereunto set myhand. A

FREDERICK A. LAVERCOMBE. Witnesses:

OLIVER B. KAISER,

EMMA SPENER.

Copies of this patent. may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D, G.

a socket formed with an external '65 an outer socket secured thereto, a core a socket fitting within 75- an electric 

